<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>symbol</title>
</head>
<body>


<script type="text/javascript">

    // symbol obj key
    // 表示 独一无二的属性值 

    /* const obj = {};
    let a = Symbol('a');
    let b = Symbol('b');
    obj[a] = 'aaa';
    obj[b] = 'bbb';

    const objectSymbols = Object.getOwnPropertySymbols(obj);

    console.log(objectSymbols); */

         

    


</script>

</body>
</html>